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How to define environment variable in create-react-app?

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Environment Variable works differently in create-react-app. To access the environment variable in your app, you have to add the prefix REACT_APP_ before defining your variable as described in the below image.


In our app, you can access this variable as a process.env variable.

let BACKENDURL = process.env.REACT_APP_BACKENDURL || "http://localhost:8080";

You can define the environment variable in the .env file. If you are hosting your app in production like Netlify or Heroku, you can define varibles in their dashboard.

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